What is in this article?:
- Peanut disease control much easier with good rotation
- Money savings add up
- Peanut producers with better rotations have more freedom when deciding on a disease control program.
- Shorter crop rotations can lead to more pressure from white mold disease.
- Peanut Rx allows growers to develop prescription fungicide programs.
WHITE MOLD DISEASE is less of a problem in peanuts where a good rotation has been followed.
Money savings add up
With most of the Peanut Rx recommendations, growers are keeping the core of a white mold program and adding or deleting leafspot sprays such as chlorothalonil. “You can save from $5 to $7 per application, and that adds up when you’re able to cut out one to three applications. With those additional chlorothalonil applications, you might be buying a little insurance.”
One of the issues with Peanut Rx is that growers could see increases in leafspot, says Hagan. “So you need to be cognizant of that if you get into a wet weather pattern, or if a tropical storm is coming. If it has been 10 days since you’ve put out a leafspot fungicide, you might want to spray in front of a tropical storm. If it has been three or four days before the storm since you’ve made an application, you’re probably in the clear. But if it has been from seven to 14 days, it’s best to get out in front of it.”
Peanut Rx is especially advantageous with new cultivars such as Georgia-06G, says Hagan. “Improved cultivars like Georgia-06G don’t lose a lot of yield as the leaves are lost to defoliation. With older varieties like Florunner, if you lost 25 to 40 percent of the leaves, then you lost 25 to 40 percent of the yield. With a variety like Georgia-06G, you don’t actually start to see the yields decrease regardless of the amount of defoliation until you get a least 70-percent defoliation. This allows you some margin of error in this type of program.”
New fungicides are on the market this year and there could be others before season’s end, says Hagan. “Fontelis from DuPont came out last year, and it has done a good job in our trials. It’s a premium leafspot/white mold material. Topguard is a triazole fungicide that’s probably similar to the old tebuconizoles, and it’s used basically in the same way, and it performs as good as or better than the old generic tebuconozoles. Priaxor is a new product from BASF and one that we’re just starting to get a look at.”
If you planted peanuts early, you definitely will have less leafspot in the field, says Hagan.
“And on the Gulf Coast, you have less risk of rust because the peanut matures before the rust moves in. But there is more risk of white mold. And if tomato spotted wilt virus ever comes back, it’ll come back with both feet on April-planted peanuts. On the flip side, the later you go, the more leafspot you’ll have because the disease will build up on the early peanuts and move on to the later ones. There will be less white mold because the peanuts will mature in September. From a disease standpoint, there are pluses and minuses in planting early. On the production side, there are more advantages than disadvantages in planting early.”